Multi-string lithium battery charging control circuit, its control method and universal charger

Abstract

The invention relates to a charge control circuit of multiple lithium batteries. The charge control circuit comprises a DC / DC conversion module, a battery pack module, a driving circuit module, a constant-voltage control module, a constant-current control module, a microprocessor module and a feedback circuit module. The input control end of the constant-voltage control module is connected with a charger interface, the input control end of the constant-current control module is connected to the corresponding pin of the microprocessor module, the feedback circuit module is connected between the negative electrode of the battery pack and the corresponding pin of the microprocessor module, and the input control end of the driving circuit module is connected with the corresponding pin of the microprocessor module, the output end of the constant-voltage control module and the output end of the constant-current control module. The invention further relates to a charge control method of the multiple lithium batteries and a general type charger. The stability is improved, and the control precision of the circuit is improved; intelligent control is achieved, the integrated degree is high, the structure of the circuit is simplified, and the production cost is controlled; the feedback speed of a microprocessor is high, real-time feedback is guaranteed, and fluctuations are reduced.

Description

technical field [0001] The invention relates to the field of charging circuits, in particular to a multi-string lithium battery charging control circuit, its control method and a universal charger. Background technique [0002] At present, the application of multi-cell lithium battery packs is becoming more and more widespread. In general lithium battery applications, a special charger is usually required to charge the battery pack. Therefore, the charger is relatively complicated and has poor versatility, resulting in an increase in product cost. On the other hand, the existing constant current and constant voltage control circuit has problems such as poor stability and low precision in the transition process from constant current charging to constant voltage charging, which affects the cost performance of the product. [0003] On the other hand, in practical applications, the prior art uses a microprocessor to read the magnitude of the current, and then adjusts the duty cy...

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Problems solved by technology

[0004] In view of the above prior art, the technical problem to be solved by the present invention is to provide a multi-string lithium battery charging control circuit, which can improve the problem of poor stability in the charging process, effectively improve the control accuracy of the circuit, and reduce the need for micro-processing. The requirements of the device and can guarantee the control effect

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